The following research findings on cohabitation outcomes are discussed: cohabiting couples without plans to marry tend to report poorer relationship quality than married couples; cohabiting couples are more likely to separate and less likely to reconcile after a separation than married couples; cohabiting couples are more likely to experience infidelity than married couples; compared to women who did not cohabit before marriage, those who did are more likely to experience divorce or separation; among individuals in their fifties, those who are cohabiting tend to have accumulated less wealth than their married peers; among mothers with infants, those in cohabiting relationships tend to fare worse economically than married mothers; men in cohabiting households tend to have lower earnings than married men with families; compared to their married peers, women who are cohabiting tend to have higher earnings relative to their partners’ earnings; compared to married individuals, those are cohabiting tend to report higher levels of depression; and individuals who are cohabiting report, on average, more alcohol problems than married individuals. Links to study citations are provided for each research finding.